Key bushing for rock-bit reamer pins



June 30, 1931. w. BRAUER KEY BUSHING FOR ROCK BIT REAMER PINS Filed Feb. 15, 1929 Patented June 30, 1931 it 1 1, 12 6 1 .UNITED STATES FATENT OFFICE I WALT R BRAUEB, or SEMINOLE, OKLAI-IOMA KEY BUSHING FOR ROCK-BIT antenna PINS Application filed February 13, 1929. Serial No. 338,623.

My invention relates to improvements in end" of the reamer pins and their slots, by a abushing for rock-bit reamer pin which can bushing, to be made of bronze or other suitalso be used asakey. able material, Which also acts as a key to The objects of my invention are to produce keep the two halves of said bit body members 5 a device of the character described which will rigidly together. It will be seen as is herein- :3. be new, novel, useful. and of utility; which after described that ifthere is any wear on will be cheap of construction; which; will be the ends of reamer pins which fit into my easily placed and installed; which will be proposed key bushingforrockbitreamerpins,

' easily replaced when worn; which will prethat it will not allow the halves of said bit vent the faces of the separate portions of the body members to loosen and cause friction. 60 body of the bitfrom galling and wearing; Reamer pins and key bushing for rock bit which will prevent the necessity of taking the reamer may be re-placed quickly, and with bit apart and sending it in for reforming comparatively small expense, and upon the and repairing; which will save much loss of drilling site.

time in drilling a well; a device which Will WVith these and other objectsin view as will 35 provide a seat for the rock-bit reamerpin more fully appear'my invention consists in within said body member of drill bit; which the construction, novel, features, and combiwill be useful for all of the purposes for nation of parts hereinafter more fully dej which it is intended. I scribed, pointed out in the claims hereto ap- 20 The usual bit now in use for such purposes pended, and illustrated in the accompanying Ti) comprises two halves of a body member one-sheet drawing, of which, adapted to close together and house pins. Figure 1 is a side elevational view of a In the present type of drill-bit which has Hughes simplex rook bit; Fig. 2 is a perf reamer rollers revolving on reamer pins, spective view of one half of body member of there is a considerable amount of wear besaid bit, showing square seats or slots for tween the body members of the bit. This is key bushing for reamer pins; Fig. 3 is a fragcaused by the ends of the reamer pins workmentary perspective view'showing the square ing loose in their respective reamer pin slots, form and seating of said bushing; Fig. i is.

allowing the body members to slip back and a perspective view showing one of reamer forth, which in turn causes the shank to gall pinswelded integral with key 'bushing,Fig. so in the drill collar. When this happens it is 5 i a perspective view of one embodiment necessary to have the reamer pin slots built f my de i Fig. 6 is a fragmentary perup and re-maehined as well as to have the inspecijive View showing the octagonal form n side surfaces of the bit body members red ttin of the bushing. V

planed or re-surfaced, and the threads on .Like characters of reference designate like drill shank re-made. The average oil field parts in allthe figures.

is not equipped to do this work, and it is It willbe observed in Figure 1 that the therefore usually necessary to ship the whole drill bit. i mainly composed of two body bit some distance to a machine shop with member halves 1 and 2, which are held to- 0 proper equipment. It also necessitates the gether at their lower end by through-bolt re-threading of the drill stem. This of 3 passing through holes as at 4 in body memcourse is quite expensive as to transportation bers 1 and 2. The upper end of said. body as Well as to the actual repairs to the bit, and members 1 and 2 are held together at their causes considerable loss of time. It is also threaded ends as indicated at 5 which are necessary to renew or re-place the reamer when in use screwed into the drill stem of a pins. In my invention, which is particularly any standard rotary drilling outfit. Reamer adaptable to what is known in the art as a, rollers 6 revolve on reamer pins 7 which are Hughes simplex rock bit, I stop the fricequipped with washers 15 and 16 to take tion between the two half body members of wear off the ends of said reamer rollers and the drill bit, and stop the wear between the seats of said respective bit body halves. The

ends of said reamer pins 7 are stationary in reamer pin slots as at 8. Said slots are cylindrical shaped, each half of body members 1 and 2 forming half of each of said slots.

My invention is a key bushing 9 with the outside of same being square as shown in Figs. 3 and 4 and with a round hole 10 through the center, but which could be formed in other shapes on the outside such as octagonal, hexagonal, and the like, as shown in Figs. 6 and 5, respectively. The exterior of key bushings 9 form keys which fit in the key slots 11, 12, 13 and 14 (better seen in Fig. 52), holding the two halves of body members 1 and 2 rigidly from any side slipping or friction. Key slots 11, 12, 13 and 14 are formed one-half each in body members 1 and 2. The lower ends of reamer pins 7 are welded, as shown at 17, into key bushing 9 to keep them from turning in key bushings when hit is in operation (see Fig. 4 and Fig.

It will be seen that by disconnecting drill bit from drill shaft by unscrewing at point 5, and then by removing through-bolt 3, that drill bit body members 1 and 2 may be taken apart readily allowing the replacement of reamer parts and key bushings. This can all be done without the removal of the bit from the drilling site.

Obviously, the invention is susceptible of embodiment in forms other than that which is illustrated in the accompanying drawings and described herein, and applicable for the uses and purposes other than as detailed, and I therefore consider as my own all such modifications and adaptations and other uses of the form of the device herein described as fairly fall within the scope of my invention.

Having thus described my invention what is claimed and desired to be secured by Letters Patent, is:

1. A device of the class described. comprising a bushing of suitable material. being adapted for use in alined pairs, each bushing having a bore for receiving and seating an end of a reamer pin, said reamer pin for carrying cutters thereon, one of said bushings having one end of said reamer pin sccurely fastened in the bore thereof, the other alined bushing adapted to fit and seat the other end of said reamer pin in the bore thereof, said bushings being adapted for seating one half each in alined grooves of the two body halves of a rock bit.

2. The combination with the two halves of a rock drilling hit, each of said halves being provided with a plurality of alined grooves adjacent their central portion for receiving and seating one half of a bushing, and with a reamer pin, said reamer pin carrying outters thereon, of a device of the class described, comprising a bushing of a suitable material for use in alined pairs, each bushing having a bore for receiving said reamer pin, one of said bores having one end of said reamer pin securely fastened therein, the bore of the bushing alined therewith adapted to lit and seat the other end of said reamer pin, one half of each of said bushings being adapted for fitting and seating in said grooves in said respective halves of said bit and to act as a key for said halves.

3. A device of the class described, comprising a square shaped bushing of a suitable material, being adapted for use in alined pairs, each bushing having a cylindrical bore for receiving and seating one end of a reamer pin, said reamer pin having cutters thereon, one of said bushings having one end of said reamer pin securely fastened in the bore thereof, the other alined bushing adapted to fit and seat the other end of said reamer pin in the bore thereof, said bushings being adapted for seating one-half each in alined grooves of the two body halves of a rock bit, said aligned grooves of the two body halves being squared to receive square bushings.

4. A device of the class described, comprising a bushing, polygonal in cross-section, adapted for use in alined pairs, each bushing having a bore for receiving and seating an end of a reamer pin securely fastened in the bore thereof, said pin for carrying a cutter thereon, the other alined bushing adapted to fit and seat the other end of said reamer pin in the bore thereof, the central portion of said reamer pin being cylindrical, said bushings adapted for seating one half each in complemental alined grooves in the two body halves of a rock bit.

WALTER BRAUER. 

